---
title: Troubleshoot ZITADEL
---

import InstanceNotFound from '/docs/self-hosting/deploy/troubleshooting/_instance_not_found.mdx';
import UpstreamHeader from '/docs/self-hosting/deploy/troubleshooting/_upstream_header.mdx'

## Instance not found


<InstanceNotFound/>


## upstream sent too big header while reading response header from upstream

<UpstreamHeader/>